WO2011162040A1 - 画像表示装置および画像表示方法 - Google Patents

画像表示装置および画像表示方法 Download PDF

Info

Publication number
WO2011162040A1
WO2011162040A1 PCT/JP2011/061026 JP2011061026W WO2011162040A1 WO 2011162040 A1 WO2011162040 A1 WO 2011162040A1 JP 2011061026 W JP2011061026 W JP 2011061026W WO 2011162040 A1 WO2011162040 A1 WO 2011162040A1
Authority
WO
WIPO (PCT)
Prior art keywords
luminance
data
display
image
emission luminance
Prior art date
Application number
PCT/JP2011/061026
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
勇司 田中
Original Assignee
シャープ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Priority to CN201180030595.XA priority Critical patent/CN102947877B/zh
Priority to US13/703,439 priority patent/US9123280B2/en
Priority to EP11797927.8A priority patent/EP2587474A4/en
Publication of WO2011162040A1 publication Critical patent/WO2011162040A1/ja

Links

Images

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
    • G09G3/003—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background to produce spatial visual effects
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0653—Controlling or limiting the speed of brightness adjustment of the illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/16—Determination of a pixel data signal depending on the signal applied in the previous frame
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/3413—Details of control of colour illumination sources

Definitions

  • the present invention relates to an image display device, and more particularly to an image display device having a function of controlling the brightness of a backlight (backlight dimming function).
  • an image display device having a backlight such as a liquid crystal display device
  • a backlight such as a liquid crystal display device
  • the power consumption of the backlight can be suppressed and the image quality of the display image can be improved.
  • by dividing the screen into a plurality of areas and controlling the luminance of the backlight light source corresponding to the area based on the input image in the area it is possible to further reduce power consumption and improve image quality.
  • area active driving such a method of driving the display panel while controlling the luminance of the backlight light source based on the input image in the area.
  • RGB three-color LEDs Light Emitting Diodes
  • white LEDs are used as a backlight light source.
  • the luminance of the LED corresponding to each area is obtained based on the maximum value or the average value of the luminance of the pixels in each area, and is given as LED data to the backlight driving circuit.
  • display data (data for controlling the light transmittance of the liquid crystal) is generated based on the LED data and the input image, and the display data is supplied to a driving circuit for the liquid crystal panel.
  • the luminance of each pixel on the screen is the product of the luminance of light from the backlight and the light transmittance based on the display data.
  • the light emitted from one LED hits a plurality of areas around the corresponding area. Accordingly, the luminance of each pixel is the product of the total luminance of light emitted from the plurality of LEDs and the light transmittance based on the display data.
  • suitable display data and LED data are obtained based on the input image, the light transmittance of the liquid crystal is controlled based on the display data, and the LED corresponding to each area based on the LED data.
  • the input image can be displayed on the liquid crystal panel.
  • the power consumption of the backlight can be reduced by decreasing the luminance of the LED corresponding to the area.
  • Japanese Patent Application Laid-Open No. 2005-241678 includes a plurality of backlight light sources and divides a screen region into a plurality of parts corresponding to these backlight light sources.
  • a configuration is disclosed in which the corresponding backlight light sources are independently controlled according to the brightness of the region. With this configuration, power consumption can be effectively reduced without waiting for feature extraction of the entire screen.
  • liquid crystal display devices that perform area active driving have become larger in screen, and if the luminance of the backlight light source is calculated in order for each divided screen area, the calculation may not be in time. Therefore, it is conceivable to calculate the luminance of the backlight light source in parallel.
  • the luminance of the backlight light source obtained as a result of the calculation does not consider the luminance of the backlight light source based on other calculations.
  • This is not particularly problematic if one area is illuminated only by one backlight light source, but one area is illuminated not only by the backlight light source directly below it but also by the surrounding backlight light sources. In case it becomes a problem. That is, when a plurality of calculations are processed independently, the brightness of pixels actually displayed is changed by the backlight light source that is not subject to the calculation, so that the display quality is deteriorated.
  • a time constant that delays the brightness change may be set in the calculation of the brightness of the backlight light source. By doing so, it is possible to suppress flicker that is visually recognized due to a drastic change in brightness (for example, every frame).
  • a drastic change in brightness for example, every frame.
  • the luminance change becomes too slow if the above time constant is set. Decrease and increase in power consumption become a problem.
  • the image brightness in which the brightness of the image may change greatly every frame (typically, a three-dimensional image in which the image for the left eye and the image for the right eye are switched for each frame), the image brightness in every two frames.
  • flicker may occur, which causes a problem of deterioration in display quality.
  • an object of the present invention is to provide an image display device and an image display method that can prevent deterioration in display quality that should occur when the luminance of a backlight light source is calculated in parallel.
  • a first aspect of the present invention is an image display device having a function of controlling the luminance of a backlight,
  • a display panel including a plurality of display elements for controlling light transmittance;
  • a backlight including a plurality of light sources;
  • An image dividing unit that generates a plurality of input images by at least one of area division within each frame or time division in units of frames of an image included in each frame in a video signal given from the outside;
  • a plurality of areas corresponding to the plurality of light sources are set for each of the plurality of input images, and a light emission luminance indicating a light emission luminance of the light source corresponding to each area based on the input image for each of the set areas
  • a process for calculating data is performed in parallel for each of the plurality of input images, and is obtained in each area based on the calculated emission luminance data for each area and the emission luminance data for a predetermined area around each area.
  • a plurality of luminance calculation units that perform parallel processing for each of the plurality of input images, for calculating display luminance that is luminance for display to be performed;
  • a display data calculation unit for obtaining display data for controlling light transmittance of the display element based on the plurality of input images and the display luminance obtained by the plurality of luminance calculation units;
  • a panel drive circuit that outputs a signal for controlling the light transmittance of the display element to the display panel based on the display data;
  • a backlight driving circuit that outputs a signal for controlling the luminance of the light source to the backlight based on the emission luminance data;
  • Each of the plurality of luminance calculation units receives another emission luminance data calculated by another luminance calculation unit or a value for calculating the other emission luminance data, and receives the other emission luminance data or the received The display luminance is calculated based on the value.
  • the image dividing unit generates the plurality of input images by area division of the image included in the video signal
  • the plurality of luminance calculation units are A plurality of light emission luminance calculating sections for obtaining the light emission luminance data corresponding to the plurality of input images by parallel processing;
  • a plurality of display brightness calculation units for obtaining the display brightness corresponding to each of the plurality of input images by parallel processing;
  • Each of the plurality of display luminance calculation units is for a predetermined area adjacent to a corresponding input image among other emission luminance data calculated by another emission luminance calculation unit corresponding to another display luminance calculation unit.
  • emission luminance data including at least emission luminance data for a plurality of areas to be set is received from the other emission luminance calculation unit, and is calculated by the received other emission luminance data and the corresponding emission luminance calculation unit.
  • the display luminance is calculated based on the emission luminance data.
  • the image dividing unit generates the plurality of input images according to a region of the image included in the video signal
  • the plurality of luminance calculation units are A plurality of light emission luminance calculating sections for obtaining the light emission luminance data corresponding to the plurality of input images by parallel processing;
  • a plurality of display luminance calculation units for obtaining the display luminance corresponding to the plurality of input images by parallel processing,
  • Each of the plurality of light emission luminance calculating units calculates a candidate value of light emission luminance data for a plurality of areas set for a corresponding input image and a predetermined area adjacent to the input image, and other light emission luminances
  • the candidate value of the other emission luminance data calculated by the calculation unit is received, and the corresponding display luminance calculation unit is based on the received candidate value of the other emission luminance data and the calculated candidate value of the emission luminance data.
  • the display luminance calculation unit calculates the display luminance based on
  • the emission luminance calculation unit obtains a maximum value among the received candidate values of the other emission luminance data and the calculated candidate value of the emission luminance data as emission luminance data to be given to the corresponding display luminance calculation unit. It is characterized by that.
  • the light emission luminance calculation unit has a predetermined ratio between the received candidate value of the other light emission luminance data and the candidate value of the light emission luminance data calculated by the light emission luminance calculation unit.
  • a fixed intermediate value is obtained as light emission luminance data to be given to a corresponding display luminance calculation unit.
  • the image dividing unit generates the plurality of input images by temporal division of the image included in the video signal
  • the plurality of luminance calculation units are A plurality of light emission luminance calculating sections for obtaining the light emission luminance data corresponding to the plurality of input images by parallel processing;
  • a plurality of display brightness calculation units for obtaining the display brightness corresponding to each of the plurality of input images by parallel processing;
  • the display luminance calculation unit is configured such that the emission luminance data calculated by the corresponding emission luminance calculation unit is another emission luminance calculated by another emission luminance calculation unit corresponding to the input image given immediately before the corresponding input image.
  • the display brightness is calculated based on the light emission luminance data obtained by subtracting a predetermined amount less than the threshold value from the other light emission luminance data when the data changes by a predetermined threshold value or more.
  • a seventh aspect of the present invention is the sixth aspect of the present invention.
  • the image dividing unit receives a 3D video signal in which a left-eye image and a right-eye image are alternately included for each frame, and alternately distributes the received 3D video signal in units of frames, whereby the left-eye image
  • the plurality of input images including the input image that is and the input image that is the right-eye image are generated.
  • the image dividing unit generates a plurality of input images by performing region division in each frame after temporal division of the image included in the video signal in units of frames
  • the plurality of luminance calculation units are A plurality of light emission luminance calculating sections for obtaining the light emission luminance data corresponding to the plurality of input images in the same frame by parallel processing;
  • a plurality of display luminance calculating units for obtaining the display luminance corresponding to the plurality of input images in the same frame by parallel processing; Including the number corresponding to the number of temporal division, parallel processing is performed for each frame,
  • the display luminance calculation unit is configured such that the emission luminance data calculated by the corresponding emission luminance calculation unit is another emission luminance calculated by another emission luminance calculation unit corresponding to the input image given immediately before the corresponding input image.
  • the display brightness is calculated based on the light emission luminance data obtained by subtracting a predetermined amount less than the threshold value from the other light emission luminance data when the data changes by a
  • the plurality of luminance calculation units deliver the calculated other emission luminance data or a value for calculating the other emission luminance data at a timing synchronized with a vertical synchronization signal included in the video signal.
  • a tenth aspect of the present invention has a function of controlling the luminance of a backlight, and includes a backlight including a light source and a plurality of display elements that display a plurality of pixels by transmitting light from the light source.
  • a control method for an image display device comprising a display panel, An image division step of generating a plurality of input images by at least one of area division within each frame or time division in units of frames of an image included in each frame in a video signal given from the outside; A plurality of areas corresponding to the plurality of light sources are set for each of the plurality of input images, and a light emission luminance indicating a light emission luminance of the light source corresponding to each area based on the input image for each of the set areas A process for calculating data is performed in parallel for each of the plurality of input images, and is obtained in each area based on the calculated emission luminance data for each area and the emission luminance data for a predetermined area around each area.
  • Display data calculation step for obtaining display data for controlling light transmittance of the display element based on the plurality of input images and the display luminance obtained in the plurality of luminance calculation steps;
  • a panel driving step for outputting a signal for controlling the light transmittance of the display element to the display panel based on the display data;
  • another emission luminance data calculated by another luminance calculation step or a value for calculating the other emission luminance data is received, and the received other emission luminance data or the received luminance data is calculated.
  • the display luminance is calculated based on the value.
  • each of the plurality of luminance calculation units receives other emission luminance data calculated by another luminance calculation unit or a value for calculating the other emission luminance data. Since the display brightness is calculated based on the other received light emission brightness data or value, the deterioration of display quality can be reduced by referring to the other backlight brightness that has not been calculated.
  • a plurality of input images are generated by image segmentation by the image segmentation unit, and each of the plurality of display luminance calculation units corresponds to another display luminance calculation unit.
  • other emission luminance data including at least emission luminance data for a plurality of areas set for a predetermined area adjacent to the corresponding input image Since the display brightness is received from the light emission brightness calculation unit, the actual display brightness when a certain area is illuminated by the surrounding backlight light source can be accurately determined by referring to the other backlight brightness that has not been calculated. Can be calculated. Therefore, since pixel display is performed with the correct display gradation over the entire screen, it is possible to prevent display quality from being deteriorated.
  • a plurality of input images are generated by image division by the image dividing unit, and each of the plurality of light emission luminance calculating units is adjacent to the corresponding input image and the input image.
  • the light emission luminance data candidate values for a plurality of areas set for the predetermined area are calculated, and other light emission luminance data candidate values calculated by other light emission luminance calculation units are received to obtain the light emission luminance data. Therefore, it is possible to eliminate or reduce the shortage of luminance according to the candidate value to be selected, or to reduce the power consumption even when the luminance is insufficient.
  • the maximum value among the candidate values of the light emission luminance data is obtained as the light emission luminance data, it is possible to eliminate the luminance deficiency and prevent the display quality from being deteriorated.
  • the fifth aspect of the present invention since an intermediate value determined by a predetermined ratio between the maximum value and the minimum value of the candidate values of the emission luminance data is obtained as the emission luminance data, the occurrence of insufficient luminance is prevented. It is possible to suppress the deterioration of the display quality, and the power consumption can be reduced as the intermediate value to be used is closer to the minimum value. Further, the intermediate value can be freely set in accordance with the necessity of improving display quality and reducing power consumption.
  • a plurality of input images are generated by temporal division of the image by the image dividing unit, and the display luminance calculating unit is configured to obtain the emission luminance data calculated by the corresponding emission luminance calculating unit. Based on the emission luminance data obtained by subtracting a predetermined amount less than the threshold value from the other emission luminance data when the emission luminance data corresponding to the input image given immediately before the corresponding input image changes by a predetermined threshold value or more. Since the display luminance is calculated, it is possible to prevent a delay in the luminance change of the backlight with respect to the (tone) change of the input image. Therefore, a reduction in display quality can be prevented, and power consumption can be reduced even when the display quality does not deteriorate.
  • the seventh aspect of the present invention when the 3D video signal is alternately distributed in units of frames by the image dividing unit, the brightness of each light source is different because the position of the display image is different between the left-eye image and the right-eye image. Therefore, flicker caused by a luminance change that occurs for each frame can be suppressed.
  • the display luminance calculation unit having both the characteristics of the second aspect of the present invention and the characteristics of the sixth aspect of the present invention provides the second and the second aspects of the present invention. The same effects as in the sixth aspect can be achieved.
  • the timing of the entire apparatus can be configured with a simple configuration. Can be adjusted accurately.
  • an effect similar to the effect in the first aspect of the present invention can be achieved in the method for controlling an image display device.
  • FIG. 1 is a block diagram illustrating a configuration of a liquid crystal display device according to a first embodiment of the present invention. It is a figure which shows the detail of the backlight shown in FIG. It is a block diagram which shows the detailed structure of the area active drive process part in the said embodiment. It is a block diagram which shows the detailed structure of the 1st area
  • FIG. 30 It is a block diagram which shows the detailed structure of the odd-numbered frame process part in the said embodiment. It is a figure which shows an example of the input image which changes for every flame
  • FIG. 1 is a block diagram showing a configuration of a liquid crystal display device 2 according to the first embodiment of the present invention.
  • the liquid crystal display device 2 shown in FIG. 1 includes a backlight 3, a backlight drive circuit 4, a panel drive circuit 6, a liquid crystal panel 7, and an area active drive processing unit 5.
  • the liquid crystal display device 2 divides the screen into a plurality of areas, and performs area active driving for driving the liquid crystal panel 7 while controlling the luminance of the backlight light source based on the input image in the area.
  • m and n are integers of 2 or more
  • i and j are integers of 1 or more
  • at least one of i and j is an integer of 2 or more.
  • the liquid crystal display device 2 receives a signal indicating an input image Dv including an R image, a G image, and a B image (hereinafter, this signal is also simply referred to as an input image Dv).
  • Each of the R image, the G image, and the B image includes luminance data of (m ⁇ n) pixels.
  • the area active drive processing unit 5 displays data used for driving the liquid crystal panel 7 (hereinafter referred to as liquid crystal data Da) and backlight control data used for driving the backlight 3 (hereinafter referred to as LED data). Db) (details will be described later).
  • the liquid crystal panel 7 includes (m ⁇ n ⁇ 3) display elements P.
  • the display elements P are arranged two-dimensionally as a whole, 3 m in the row direction (horizontal direction in FIG. 1) and n in the column direction (vertical direction in FIG. 1).
  • the display element P includes an R display element that transmits red light, a G display element that transmits green light, and a B display element that transmits blue light.
  • the R display element, the G display element, and the B display element are arranged side by side in the row direction, and three pixels form one pixel.
  • the liquid crystal panel 7 is composed of a large number of display elements P including liquid crystal, but a shutter made of a known material having electro-optical characteristics capable of controlling the light transmittance from the backlight 3 instead of the liquid crystal. An element may be used.
  • the panel drive circuit 6 is a drive circuit for the liquid crystal panel 7.
  • the panel drive circuit 6 outputs a signal (voltage signal) for controlling the light transmittance of the display element P to the liquid crystal panel 7 based on the liquid crystal data Da output from the area active drive processing unit 5.
  • the voltage output from the panel drive circuit 6 is written to a pixel electrode (not shown) in the display element P, and the light transmittance of the display element P changes according to the voltage written to the pixel electrode.
  • the backlight 3 is provided on the back side of the liquid crystal panel 7 and irradiates the back surface of the liquid crystal panel 7 with backlight light.
  • FIG. 2 is a diagram showing details of the backlight 3.
  • the backlight 3 includes (i ⁇ j) LED units 32.
  • the LED units 32 are two-dimensionally arranged as a whole, i in the row direction and j in the column direction.
  • the LED unit 32 includes one red LED 33, one green LED 34, and one blue LED 35. Light emitted from the three LEDs 33 to 35 included in one LED unit 32 hits a part of the back surface of the liquid crystal panel 7.
  • the LED unit 32 may be a plurality of LEDs that emit colors other than the RGB colors, or may be a white LED when the luminance is not changed for each color.
  • the backlight 3 is preferably composed of an LED capable of adjusting the brightness at high speed, but other well-known light sources such as CCFL (Cold Cathode Fluorescent Lamp) may be used.
  • CCFL Cold Cathode Fluorescent Lamp
  • the backlight drive circuit 4 is a drive circuit for the backlight 3.
  • the backlight drive circuit 4 outputs a signal (voltage signal or current signal) for controlling the luminance of the LEDs 33 to 35 to the backlight 3 based on the LED data Db output from the area active drive processing unit 5.
  • the brightness of the LEDs 33 to 35 is controlled independently of the brightness of the LEDs inside and outside the unit.
  • the screen of the liquid crystal display device 2 is divided into (i ⁇ j) areas, and one LED unit 32 is associated with one area.
  • the structure by which the 2 or more LED unit 32 is matched with one area may be sufficient.
  • the area active drive processing unit 5 obtains the luminance of the red LED 33 corresponding to the area based on the R image in the area.
  • the luminance of the green LED 34 is determined based on the G image in the area
  • the luminance of the blue LED 35 is determined based on the B image in the area.
  • the area active drive processing unit 5 calculates the brightness of all the LEDs 33 to 35 included in the backlight 3 and outputs LED data Db representing the calculated LED brightness to the backlight drive circuit 4.
  • the area active drive processing unit 5 obtains the luminance of the backlight light in all the display elements P included in the liquid crystal panel 7 based on the LED data Db. Further, the area active drive processing unit 5 obtains the light transmittance of all the display elements P included in the liquid crystal panel 7 based on the input image Dv and the luminance of the backlight light, and the liquid crystal data representing the obtained light transmittance. Da is output to the panel drive circuit 6. A detailed description of how to obtain the luminance of the backlight light in the area active drive processing unit 5 will be described later.
  • the luminance of the R display element is a product of the luminance of the red light emitted from the backlight 3 and the light transmittance of the R display element.
  • the light emitted from one red LED 33 hits a plurality of areas around the corresponding one area. Therefore, the luminance of the R display element is the product of the total luminance of light emitted from the plurality of red LEDs 33 and the light transmittance of the R display element.
  • the luminance of the G display element is the product of the total luminance of light emitted from the plurality of green LEDs 34 and the light transmittance of the G display element, and the luminance of the B display element is emitted from the plurality of blue LEDs 35. This is the product of the total light luminance and the light transmittance of the B display element.
  • suitable liquid crystal data Da and LED data Db are obtained based on the input image Dv, the light transmittance of the display element P is controlled based on the liquid crystal data Da, and the LED data
  • the input image Dv can be displayed on the liquid crystal panel 7 by controlling the luminance of the LEDs 33 to 35 based on Db.
  • the power consumption of the backlight 3 can be reduced by reducing the luminance of the LEDs 33 to 35 corresponding to the area.
  • the resolution of the image can be increased and the image quality of the display image can be improved by switching the luminance of the display element P corresponding to the area between smaller levels.
  • FIG. 3 is a block diagram showing a detailed configuration of the area active drive processing unit 5 in the present embodiment.
  • the area active drive processing unit 5 shown in FIG. 3 divides an input image and processes it in parallel, an image region dividing unit 505, first and second region processing units 510 and 520, and LED output value combination.
  • the liquid crystal display device that performs area active drive has a large screen, and if the brightness of the backlight light source is calculated in order for each divided screen area, the calculation may not be in time. Therefore, in the present embodiment, the input image Dv is divided into two by the image region dividing unit 505, and the brightness of the backlight light source is calculated in parallel in the first and second region processing units 510 and 520.
  • the first and second area processing units 510 and 520 are calculated in the area by exchanging LED data (light emission luminance data) Db1 and Db2 that are the calculated backlight luminance data. Reference is made to the backlight luminance in the other region that was not present.
  • LED data light emission luminance data
  • the display luminance corresponding to the actual brightness of the area can be accurately calculated (specifically, the luminance distribution can be accurately calculated). Calculation can be performed). Therefore, since pixel display is performed with the correct display gradation over the entire screen, it is possible to prevent display quality from being deteriorated.
  • the first area processing unit 510 does not necessarily require all of the LED data Db2. That is, it corresponds to an image region that is not a calculation target (an image region that is a calculation target in the second region processing unit 520) with respect to an image region that is a calculation target in the first region processing unit 510. Not all of the backlight light sources to be affected affect the area between adjacent areas or adjacent areas (for example, up to two or three areas away). Therefore, the exchanged LED data Db1 and Db2 may be partial data corresponding to the range in which the influence occurs, specifically, a data portion corresponding to an area adjacent to or close to the other region.
  • the liquid crystal data Da1 and Da2 which are pixel values calculated in the first and second area processing units 510 and 520 are combined by the LCD data combining unit 540 and given to the panel driving circuit 6 as one liquid crystal data Da. . Further, the calculated LED data Db1 and Db2 are combined by the LED output value combining unit 530 and given to the backlight drive circuit 4 as one LED data Db.
  • the panel drive circuit 6 in this embodiment drives one liquid crystal panel with one data driver (and gate driver), but drives the left screen data driver and the right half for driving the left half of the liquid crystal panel.
  • a configuration including a right screen data driver is also conceivable.
  • the LCD data combining unit 540 is omitted, and the liquid crystal data Da1, which is the pixel value calculated by the first region processing unit 510, is directly supplied to the right screen data driver, and the second region processing unit 520
  • the calculated liquid crystal data Da2 may be directly provided to the left screen data driver.
  • a single display device composed of two liquid crystal panels can also be driven in the same manner as described above.
  • the LED data calculation unit is provided in each of the first and second region processing units and performs parallel calculation.
  • the display luminance calculation unit is configured to perform parallel calculation, the liquid crystal data Need not be calculated by parallel computation. Therefore, instead of the two LED data calculation units, the display luminance corresponding to each input image output from the display luminance calculation unit provided in each of the first and second region processing units is received, and one based on these is received.
  • a configuration may be provided in which one LED data calculation unit that calculates the liquid crystal data Da is provided.
  • the detailed configuration of the first area processing unit 510 in the present embodiment will be described with reference to FIG. Note that the detailed configuration of the second area processing unit 520 is also the same as that of the first area processing unit 510, and thus the description thereof is omitted.
  • FIG. 4 is a block diagram showing a detailed configuration of the first area processing unit in the present embodiment.
  • the first area processing unit 510 includes an LED output value calculation unit 511, an image memory 512, a display luminance calculation unit 513, and an LCD data calculation unit 514 as components for executing predetermined processing.
  • a luminance diffusion filter 14 As a component for storing predetermined data to be described later, a luminance diffusion filter 14 as shown in FIG. 5 is provided.
  • a light emission luminance calculation unit is realized by the LED output value calculation unit 511
  • a display data calculation unit is realized by the LCD data calculation unit 514.
  • the LED output value calculation unit 511 also includes components for storing predetermined data.
  • the LED output value calculation unit 511 divides the input image Dv1 obtained by dividing the region by the image region dividing unit 505 into a plurality of areas, and LED data (indicating luminance at the time of light emission of the LED corresponding to each area) Emission luminance data) Db1 is obtained.
  • LED output value the value of the luminance when the LED emits light.
  • the luminance diffusion filter 14 stores PSF data, which is data representing numerically how light is diffused in order to calculate the actual display luminance of each area.
  • the display luminance calculation unit 513 calculates the actual display luminance Db1c in each area based on the LED data Db1 obtained by the LED output value calculation unit 511 and the PSF data Dp stored in the luminance diffusion filter 14.
  • the display luminance corresponds to the actual brightness of an area when the area is illuminated by the LED unit in the area and the surrounding area.
  • the luminance for this is referred to as display luminance in this specification.
  • the image memory 512 functions as a delay unit that stores the input image Dv1 (which is the left half of the input image Dv) for a predetermined number of frames, and outputs the input image Dv1 in order after being delayed by a predetermined number of frames from the previously stored image.
  • the display luminance calculation unit 513 matches the timing with the display luminance Db1c of each area that is output with a delay (corresponding correctly).
  • the LCD data calculation unit 514 It should be noted that the image memory 512 can be omitted when the calculation can be performed at such a high speed that the delay does not become a problem.
  • the LCD data calculation unit 514 is configured to display all display elements P included in the liquid crystal panel 7 based on the input image Dv1m output from the image memory 512 and the display luminance Db1c of each area obtained by the display luminance calculation unit 513.
  • the liquid crystal data Da1 representing the light transmittance is obtained. The calculation method will be described later.
  • the components included in the second region processing unit 520 are the same as the above-described components included in the first region processing unit 510, the supplied image data is the input image Dv2, and the output data is Since the liquid crystal data Da2 and the LED data Db2 operate in the same manner, the description thereof is omitted here.
  • the area active drive processing unit 5 calculates and outputs the liquid crystal data Da1, Da2 and the LED data Db1, Db2 as described above, and the processing procedure will be described in detail below with reference to FIG.
  • FIG. 6 is a flowchart showing a process flow of the area active drive processing unit 5.
  • An image of a certain color component (hereinafter referred to as color component C) included in the input image Dv is input to the area active drive processing unit 5.
  • the area active drive processing unit 5 (the image region dividing unit 505 included in the area active drive processing unit 5 divides the input image Dv of the color component C into two equal parts to the left and right, and the left half of the input image of the color component C (hereinafter simply referred to as “input image”).
  • Dv1 and a right half portion (hereinafter simply referred to as “input image”) Dv2 of the input image of the color component C are generated (step S11).
  • the divided input images of the color component C include the luminance of (m / 2 ⁇ n) pixels.
  • the area active drive processing unit 5 performs sub-sampling processing (averaging processing) on the input images Dv1 and Dv2 of the color component C, and (si / 2 ⁇ sj) (s is an integer of 2 or more) Two corresponding reduced images including the luminance of the pixel are obtained (step S12).
  • the input images Dv1 and Dv2 of the color component C are reduced by (si / m) times in the horizontal direction and (sj / n) times in the vertical direction.
  • the area active drive processing unit 5 divides the reduced image into (i / 2 ⁇ j) areas (step S13). Each area includes the luminance of (s ⁇ s) pixels.
  • the area active drive processing unit 5 obtains an LED output value (luminance value at the time of LED emission) for each of (i / 2 ⁇ j) areas in the input images Dv1 and Dv2 (step S14).
  • the LED output value is determined based on, for example, a method based on the maximum luminance value Ma of the pixels in the area, a method based on the average luminance Me of the pixels in the area, or the area.
  • the processing from step S11 to step S14 is performed in parallel by the LED output value calculation unit 511 provided in each of the first and second region processing units 510 and 520 in the area active drive processing unit 5.
  • the area active drive processing unit 5 exchanges the LED output values Db1 and Db2 calculated in parallel in the first and second region processing units 510 and 520, respectively (step S15). That is, the LED output value Db1 calculated in the first area processing unit 510 is given to the second area processing unit 520, and the LED output value Db2 calculated in the second area processing unit 520 is given to the first area processing unit. 510.
  • step S16 the area active drive processing unit 5 applies the luminance diffusion filter (point diffusion filter) 14 to each of the (i / 2 ⁇ j) LED output values obtained in step S15, thereby obtaining (ti / First backlight luminance data including 2 ⁇ tj) (t is an integer of 2 or more) display luminance is obtained (step S16).
  • step S16 (i / 2 ⁇ j) LED output values are enlarged t times in the horizontal and vertical directions, respectively, and (ti / 2 ⁇ tj) display luminances are obtained. Note that the processing in step S16 is performed by the display luminance calculation unit 513 in the area active drive processing unit 5.
  • the area active drive processing unit 5 obtains second backlight luminance data including (m / 2 ⁇ n) luminances by performing linear interpolation processing on the first backlight luminance data.
  • Step S17 the first backlight luminance data is enlarged (m / 2 / ti) times in the horizontal direction and (n / 2 / tj) times in the vertical direction.
  • the second backlight luminance data indicates that (m / 2 ⁇ n) color components C are displayed when (i / 2 ⁇ j) color component C LEDs emit light with the luminance obtained in step S15. This represents the luminance of the backlight of the color component C incident on the element P.
  • the area active drive processing unit 5 includes the luminance of (m / 2 ⁇ n) pixels included in the input image of the color component C, respectively, in the second backlight luminance data (m / 2).
  • the light transmittance T of the display element P of (m / 2 ⁇ n) color components C is obtained by performing a comparative calculation such as dividing by ( ⁇ n) luminances (step S18).
  • the processes in steps S16 to S18 are performed by the LCD data calculation unit 514 provided in each of the first and second region processing units 510 and 520 in the area active drive processing unit 5.
  • the area active drive processing unit 5 combines the liquid crystal data Da1 and Da2 representing (m / 2 ⁇ n) light transmittances obtained in step S18 for the color component C, and obtained in step S15. Combining (i / 2 ⁇ j) LED data Db1 and Db2 representing LED output values, (m ⁇ n) liquid crystal data Da representing light transmittance, and (i ⁇ j) LED output values. LED data Db representing each is output (step S19). The process of step S19 is performed by the LCD data combining unit 540 and the LED output value combining unit 530 in the area active drive processing unit 5.
  • the area active drive processing unit 5 performs the processing shown in FIG. 6 on the R image, the G image, and the B image, and based on the input image Dv including the luminance of (m ⁇ n ⁇ 3) pixels ( Liquid crystal data Da representing m ⁇ n ⁇ 3) transmittance and LED data Db representing (i ⁇ j ⁇ 3) LED output values are obtained.
  • the sub-sampling process is performed on the input images Dv1 and Dv2 of the color component C including the luminance of (960 ⁇ 1080) pixels, thereby reducing the luminance of (160 ⁇ 160) pixels.
  • a reduced image is obtained.
  • the reduced image is divided into (16 ⁇ 16) areas (area size is (10 ⁇ 10) pixels).
  • the maximum value data including (16 ⁇ 16) maximum values and the average value data including (16 ⁇ 16) average values are obtained. can get.
  • LED luminances (LED output values) are obtained.
  • LED data of the color component C to be expressed is obtained.
  • first backlight luminance data including (90 ⁇ 90) display luminances is obtained.
  • second backlight luminance data including (960 ⁇ 1080) display luminances is obtained.
  • the color component C including (960 ⁇ 1080) light transmittances. LCD data can be obtained.
  • the area active drive processing unit 5 sequentially performs the process for each color component image.
  • the process for each color component image may be performed in a time-sharing manner.
  • it may be configured to perform parallel processing for each color.
  • the backlight luminance may be simply set according to the (composite) luminance of all the color components of the input image.
  • the area active drive processing unit 5 performs sub-sampling processing on the input image for noise removal, and performs area active drive based on the reduced image, but based on the original input image. Area active drive may be performed.
  • FIG. 8 is a diagram showing an example of an image given to the present liquid crystal display device
  • FIG. 9 is a graph showing the relationship between the pixel gradation and the pixel position on the center line shown in FIG.
  • the left half as a whole is a large (bright) area with a large gradation value
  • the right half is a small (dark) area with a small gradation value, and is near the center of the image.
  • a rectangular area of intermediate gradation is included. Therefore, as shown in FIG.
  • the pixel gradation in the center line C when the image is divided into two parts up and down is a large value from the left end of the image to the vicinity of the center, the intermediate value is an intermediate value, and the vicinity of the center to the right end becomes a small value.
  • the input image Dv is divided into two by the image region dividing unit 505, as shown in the figure, input images Dv1 and Dv2.
  • One of the divided input images Dv1 is supplied to the first region processing unit 510, and the other input image Dv2 is supplied to the second region processing unit 520, and is the corresponding backlight luminance data as described above.
  • LED data Db1 and Db2 are calculated. These LED data Db1 and Db2 are given to the backlight drive circuit 4, and each LED unit 32 included in the backlight 3 is lit with a predetermined luminance.
  • FIG. 10 is a diagram simply showing the lighting brightness of each LED unit for displaying the image shown in FIG.
  • the backlight 3 is shown as a circle consisting of eight LED units 32.
  • a white circle indicates that the LED unit 32 has a large luminance value (bright)
  • a black circle indicates that the LED unit 32 has a small luminance value (dark)
  • a hatched circle indicates a luminance value. Indicates that the LED unit 32 is an intermediate value.
  • the backlight corresponding to display the input image Dv1 is lit at a high luminance (for example, the maximum luminance value 255), and the backlight corresponding to display the input image Dv2 is an intermediate value.
  • Lights up for example, intermediate luminance value 127) or low luminance (for example, minimum luminance value 0). Note that, when the minimum luminance value is set to 0, the backlight is turned off, but for convenience of explanation, it is expressed that the luminance value is also turned on in such a case.
  • the LED data Db1 and Db2 for turning on the backlight as described above are exchanged between the first and second area processing units 510 and 520, and based on these LED data Db1 and Db2, the first data
  • An actual display brightness Db1c is calculated by the display brightness calculation unit 513 provided in the area processing unit 510, and an actual display is displayed by the display brightness calculation unit 513 provided in the second area processing unit 520 (similarly, not shown).
  • a luminance Db2c is calculated.
  • FIG. 11 is a graph showing an actual display luminance distribution of the LED unit shown in FIG.
  • the horizontal axis shown in FIG. 11 indicates the pixel position along the center line C, and the vertical axis indicates the display luminance at the position corresponding to the position.
  • the solid lines in the figure indicate the display luminances Db1c and Db2c calculated by the display luminance calculation unit 513, and the dotted lines in the figure indicate the display luminance calculation unit in which the LED data Db1 and Db2 are not exchanged (the present invention is not applied).
  • both the LED data Db1 and Db2 are referred to, and therefore, in the vicinity of the boundary between the area corresponding to the input image Dv1 and the area corresponding to the input image Dv2.
  • the brightness of LED units adjacent or adjacent to the other affected area is taken into account. Therefore, as indicated by a solid line in FIG. 11, the distribution of display luminance changes continuously (slowly) with respect to the change in pixel position. Note that the display luminance distribution calculated in this manner substantially matches the actual luminance distribution if the calculation accuracy is high.
  • the pixel gradation value (liquid crystal data) is calculated on the assumption that the display luminance is different from the actual luminance (by the calculation unit corresponding to the LCD data calculation unit 514).
  • the actually displayed image will be different from the input image Dv. This point will be described with reference to FIGS.
  • FIG. 12 is a diagram showing an image display example when the present invention is not applied
  • FIG. 13 is a graph showing the relationship between the pixel gradation and the pixel position on the center line C shown in FIG.
  • the display image shown in FIG. 12 is that the left half is a large (bright) region with a large gradation value and the right half is a small (dark) region with a small gradation value as a whole.
  • the gradation of the intermediate gradation rectangular area to be displayed near the center of the image is significantly different from the gradation shown in FIG. That is, the present invention at the position corresponding to the above-described halftone rectangular area indicated by the solid line in FIG. 13 is not applied to the gradation value in the present embodiment indicated by the dotted line in FIG. 13 (shown in FIG. 9).
  • the gradation value at is greatly deviated. This shift is particularly large near the boundary between the input images Dv1 and Dv2.
  • the LED data Db1 and Db2 can be exchanged with each other in the first and second region processing units 510 and 520, and the display luminance can be accurately calculated. No gradation shift occurs and display abnormality as shown in FIG. 12 does not occur. Therefore, since pixel display is performed with the correct display gradation over the entire screen, display quality deterioration can be prevented.
  • Second Embodiment> ⁇ 2.1 Overall configuration and operation>
  • the configuration and operation of the liquid crystal display device 2 according to the second embodiment of the present invention are substantially the same as the configuration and operation of the liquid crystal display device 2 according to the first embodiment shown in FIG.
  • the detailed configuration and operation of the area active drive processing unit 5 are slightly different from those in the first embodiment.
  • FIG. 14 is a block diagram showing a detailed configuration of the area active drive processing unit 5 in the present embodiment.
  • the area active drive processing unit 5 shown in FIG. 14 includes an image area dividing unit 505 and an LCD data combining unit 540 similar to those in the first embodiment shown in FIG. 3, and the LED data Db1 and Db2 are not exchanged.
  • first and second region processing units 610 and 620 for exchanging pre-correction LED data Db1p and Db2p including LED data portions corresponding to overlapping regions to be described later.
  • the reason why the LED data Db1 and Db2 are not exchanged in this way is that, based on the exchanged data, the LED data Db1 and Db2 are corrected so as not to cause insufficient backlight luminance in the overlapping region.
  • the configuration of the backlight 3 in the liquid crystal display device 2 according to the second embodiment of the present invention is the same as the configuration of the backlight 3 in the first embodiment shown in FIG. Since the overall processing procedure is substantially the same as the processing procedure in the first embodiment shown in FIG. 6, the same components (and processing procedures) are denoted by the same reference numerals and the description thereof is omitted. .
  • the detailed configuration of the first area processing unit 610 in the present embodiment will be described with reference to FIG.
  • the second region processing unit 620 is the same as the configuration of the first region processing unit 610 except that it does not output the LED data Db as will be described later, and thus the description thereof is omitted.
  • FIG. 15 is a block diagram showing a detailed configuration of the first area processing unit in the present embodiment.
  • the first area processing unit 610 includes the same image memory 512, LCD data calculation unit 514, and luminance diffusion filter 14 as those in the first embodiment, and LED output value calculation different from that in the first embodiment.
  • the same components are denoted by the same reference numerals, description thereof is omitted, and the operation of the different components will be described in detail.
  • the LED output value calculation unit 611 obtains LED data (light emission luminance data) corresponding to each area set in the input image Dv1, and each set in the input image Dv2. Among the areas, LED data corresponding to an area adjacent to (or close to) the area set in the input image Dv1 (hereinafter referred to as “adjacent area”) is obtained, and these are output as uncorrected LED data Db1p.
  • the pre-correction LED data Db1p is given to the second area processing unit 620.
  • the overlapping region correction unit 615 receives the pre-correction LED data Db1p from the LED output value calculation unit 611 and the pre-correction LED data Db2p from the second region processing unit 620, and adjoins the input image Dv1 that is the overlapping region.
  • LED data respectively corresponding to the area and the adjacent area of the input image Dv2 is obtained by a method described later.
  • the LED data corresponding to the obtained overlapping area and the LED data corresponding to the other area of the input image Dv1 obtained by the same method as in the first embodiment are output as LED data Db1.
  • LED data corresponding to all of the input image Dv1 and the input image Dv2 including the overlapping area is output as LED data Db.
  • the LED data Db can be output from the second region processing unit 620 (overlapping region correction unit provided in the same), but the LEDs obtained in the first and second region processing units 610 and 620 Since the data Db is the same, it is sufficient that the LED data Db obtained in either one is output. In this case, the data Db is output from the first region processing unit 610.
  • the display luminance calculation unit 613 calculates the actual display luminance Db1c in each area based on the LED data Db1 obtained by the overlapping region correction unit 615 and the PSF data Dp stored in the luminance diffusion filter 14.
  • the LED data Db1 does not include all LED data corresponding to the input image Dv2, but includes LED data corresponding to the adjacent area of the input image Dv1.
  • the LED data Db1 may not be output from the overlapping area correction unit 615b, and only the LED data Db may be output.
  • the display luminance calculation unit 613 does not take time to calculate the display luminance. It is preferable to use only the portion corresponding to the LED data Db1 in the display luminance calculation. Note that if the display luminance calculation unit 613 needs all LED data, the LED data Db and the LED data Db1 can be shared. Next, calculation of LED data in the LED output value calculation unit 611 and calculation method of LED data corresponding to the overlapping region by the overlapping region correction unit 615 will be described with reference to FIGS.
  • FIG. 16 is a diagram illustrating an example of an input image given in the present embodiment.
  • the left half is a large (bright) area with a large gradation value
  • the right half is a small (dark) area with a small gradation value.
  • FIG. 17 is a diagram showing a correspondence relationship between the LED data Db1 and Db2 and the LED unit when the same LED unit as that shown in FIG. 10 is arranged.
  • the LED data Db1 corresponds to the four LED units in the left half as well as two LED units adjacent thereto
  • the LED data Db2 is the four LED units in the right half.
  • the data corresponds to two LED units adjacent to these, and the data is duplicated in four LED units in the overlapping area Ao indicated by a dotted line in the drawing.
  • the overlapping data portion has the same contents in the LED data Db1 and the LED data Db2.
  • the LED data Db including the overlapping portion is received from the first area processing unit 610.
  • the output is provided to the backlight drive circuit 4.
  • FIG. 18 is a diagram simply showing the lighting brightness indicated by the pre-correction LED data Db1p for displaying the image shown in FIG. 16, and FIG. 19 is the pre-correction LED data for displaying the image shown in FIG. It is a figure which shows simply the lighting brightness
  • a white circle indicates that the luminance value is large (bright)
  • a black circle indicates that the luminance value is small (dark).
  • the pre-correction LED data Db1p As can be seen from FIG. 18, among the pre-correction LED data Db1p, the data to be set in the four LED units on the left half corresponding to the input image Dv1 illuminate pixels with large gradation values. Therefore, the luminance value becomes large (for example, the maximum luminance value 255).
  • the pre-correction LED data Db1b is not actually set for the LED unit, but post-correction LED data Db, which will be described later, is set.
  • the value of data to be set in two LED units corresponding to an area adjacent to the input image Dv1 included in the input image Dv2 (adjacent area A1 indicated by a dotted line in the drawing) Is determined with reference to a value to be set for the LED unit adjacent to the adjacent area A1.
  • the luminance value of a certain LED unit included in the adjacent area A1 is set to the maximum value among the luminance values to be set for the surrounding LEDs. Therefore, in the above example, as shown in FIG. 18, a large luminance value (for example, the maximum luminance value 255) is set for all LED units included in the adjacent area A1 (shown as white circles in the drawing). )
  • the pre-correction LED data Db2p is set in the same manner as the pre-correction LED data Db1p, and as shown in FIG. 19, the LED unit corresponding to the input image Dv2 and the dotted line in the figure included in the input image Dv1 are shown.
  • the data to be set for the LED unit corresponding to the adjacent area A2 has a small luminance value (for example, the minimum luminance value 0).
  • the overlapping area correction unit 615 is the correction data calculated in the second area processing unit 620 (the LED output value calculation unit) in the same manner as the pre-correction LED data Db1p calculated in the LED output value calculation unit 611 as described above. Based on the previous LED data Db2p, LED data Db and LED data Db1 are calculated. Specifically, for the LED data Db1 corresponding to the input image Dv1 other than the overlapping area Ao (shown in FIG. 17), the value of the uncorrected LED data Db1p is selected as it is, and the LED data Db1 corresponding to the overlapping area Ao.
  • the larger (maximum) value of the pre-correction LED data Db1p and Db2p is selected, and these selected values are output as LED data Db1.
  • the data obtained by adding the remaining portion corresponding to the input image Dv2 other than the overlapping area Ao to the LED data Db1 is output as LED data Db corresponding to the entire input images Dv1 and Dv2 (that is, the input image Dv). Is done.
  • the LED data Db2 is output in the same manner as described above, but the LED data Db having the same content is not output.
  • FIG. 20 is a diagram simply showing the lighting luminance indicated by the LED data Db1 calculated as described above
  • FIG. 21 is a diagram simply showing the lighting luminance indicated by the LED data Db2.
  • the maximum value of the overlapping area corresponding to the overlapping area Ao shown in FIG. 17 is a value corresponding to a white circle (for example, maximum luminance value 255). Therefore, also in FIGS. 20 and 21, the LED unit corresponding to the region is indicated by a white circle (for example, has a maximum luminance value of 255), and the LED units corresponding to other regions are illustrated in FIG. 20. Is indicated by white circles as in FIG. 18, and is indicated by black circles in FIG. 21 as in FIG. 19 (for example, the minimum luminance value is 0).
  • the LED data Db calculated in the first area processing unit 610 in this way is given to the backlight drive circuit 4, and for example, as shown in FIG. 22, the LED unit is turned on with a luminance corresponding to the data. .
  • FIG. 22 is a diagram showing a lighting state of the backlight when the input image shown in FIG. 16 is given.
  • LED data Db1 for controlling the corresponding LED unit to be in the lighting state shown in FIG. 20 and the corresponding LED unit to be in the lighting state shown in FIG. It can be seen that LED data Db2 for controlling the corresponding LED unit is obtained so as to be in the lighting state shown in FIG.
  • FIG. 23 is a diagram showing a lighting state of the backlight when the configuration of the present embodiment is not adopted.
  • the LED output value calculation unit 611 included in the first region processing unit 610 according to the present embodiment exchanges the backlight luminance data in the overlapping region, and therefore, the area corresponding to the corresponding input image Dv1 and its adjacent area.
  • the luminance in the area is calculated, when simply performing parallel calculation without adopting the configuration of this embodiment, only the luminance in the area corresponding to the corresponding input image Dv1 is calculated.
  • the lighting state of the LED unit corresponding to the LED data Db obtained as a result is as shown in FIG. However, in such a lighting state of the LED unit, the display quality may be deteriorated due to insufficient luminance as shown in FIG.
  • FIG. 24 is a diagram illustrating an example of a display image when a luminance shortage occurs in a configuration that does not employ the configuration of the present embodiment.
  • the input image corresponding to the display image example shown in FIG. 24 is the image example shown in FIG. 16, in which the left half is a region having a large gradation value (here, the maximum gradation), and the right half is This is a region having a small gradation value (here, the minimum gradation).
  • the gradation value of the boundary region Ab indicated by the oblique line that should be the maximum gradation value does not reach the maximum, and therefore the display quality is deteriorated. Yes.
  • the surrounding area is also illuminated, and all LED units are lit at maximum brightness (or a large predetermined brightness).
  • the (maximum) luminance of each LED unit is set so that an image can be displayed with the maximum gradation.
  • it is assumed that such a maximum luminance is set. In this case, even if a certain LED unit is lit at the maximum luminance, the luminance of the area corresponding to the LED unit may be insufficient.
  • the left half is an area with a large gradation value (here, maximum gradation), and the right half is an area with a small gradation value (here, minimum gradation).
  • the gradation value of the boundary region Ab indicated by the oblique line that should be the maximum gradation value does not reach the maximum. That is, the luminance of the LED unit corresponding to the boundary region Ab is insufficient as shown in FIG.
  • FIG. 25 is a graph showing the actual luminance distribution of the LED unit shown in FIG. 23 in a configuration that does not employ the configuration of the present embodiment.
  • the horizontal axis shown in FIG. 25 indicates the pixel position along the center line that divides the top and bottom of the image, and the vertical axis indicates the luminance at the position corresponding to the position.
  • a dotted line in the figure indicates a pixel position corresponding to the boundary region Ab.
  • FIG. 26 is a graph showing the actual luminance distribution of the LED unit in the present embodiment shown in FIG.
  • the luminance at the position also has the maximum value, and there is no shortage of luminance.
  • the configuration and operation of the liquid crystal display device 2 according to the third embodiment of the present invention are substantially the same as the configuration and operation of the liquid crystal display device 2 according to the first embodiment shown in FIG.
  • the detailed configurations and operations of the active drive processing unit 5 and the first region processing unit 610 are the same except for the operation of the overlapping region correction unit 615 (and the overlapping region correction unit (not shown) provided in the second region processing unit 620).
  • This is the same as the second embodiment shown in FIGS. Therefore, the same components are denoted by the same reference numerals, and the description thereof is omitted.
  • the operation of the overlapping area correction unit 615 in the present embodiment will be described with reference to FIG.
  • FIG. 27 is a diagram simply showing the lighting brightness of the LED unit in the present embodiment when the input image shown in FIG. 16 is displayed.
  • the overlapping area correction unit 615 in the present embodiment is other than the overlapping area Ao.
  • the LED data Db1 corresponding to the input image Dv1 operates in the same manner as in the second embodiment in that the value of the uncorrected LED data Db1p is selected as it is, but the LED data corresponding to the overlap area Ao.
  • the Db1 portion is not selected from the larger (maximum) value of the pre-correction LED data Db1p and Db2p, but is given an intermediate value between these values. Is different.
  • LED data Db2 in which an intermediate value is given to data corresponding to the overlapping region is output in the same manner as described above. In this way, by providing an intermediate value instead of a larger value in the overlapping area, it becomes possible to achieve a good balance between eliminating the insufficient luminance of the backlight that tends to occur in the overlapping area and reducing power consumption. .
  • the power consumption can be sufficiently reduced as in the case of the first embodiment, and if the coefficient a is set large, the luminance is insufficient. Since the occurrence is suppressed, it is possible to sufficiently prevent the display quality from being deteriorated.
  • setting a 0.8 gives priority to improving display quality
  • setting a 0.2 gives priority to reducing power consumption
  • setting a 0.5 gives average display quality. The effects of improving and reducing the average power consumption can be obtained. Note that this value may be fixed or set arbitrarily by the user.
  • the backlight luminance data in the overlapping area near the boundary of the input image is exchanged as in the second embodiment, and the exchanged data is performed so that the luminance is not insufficient in the overlapping area.
  • FIG. 28 is a block diagram showing a detailed configuration of the area active drive processing unit 5 in the present embodiment.
  • the area active drive processing unit 5 shown in FIG. 28 distributes an input image frame by frame (divided in time) and performs parallel processing, an image time division unit 705, an odd frame processing unit 710, An even frame processing unit 720, an LED output value switching unit 730, and an LCD data switching unit 740 are provided.
  • a liquid crystal display device that performs area active driving has a large screen, and if the brightness of the backlight light source for one screen is calculated during one frame period, the calculation may not be in time.
  • the input image Dv is time-divided into two input images by switching between the odd-numbered frame and the even-numbered frame by the image time-dividing unit 705, and the odd-numbered frame processing unit 710 and the even-numbered frame processing In the unit 720, the brightness of the backlight light source is calculated in parallel (within 2 frame periods).
  • the odd-numbered frame processing unit 710 and the even-numbered frame processing unit 720 exchange LED data (emission luminance data) Dbf1 and Dbf2 that are calculated backlight luminance data (specifically, as described later).
  • LED data emission luminance data
  • Dbf1 and Dbf2 are calculated backlight luminance data (specifically, as described later).
  • the liquid crystal data Daf1 and Daf2 which are pixel values calculated by the odd frame processing unit 710 and the even frame processing unit 720 are received by being switched for each frame by the LCD data switching unit 740, and one continuous liquid crystal data Da. Is given to the panel drive circuit 6 as follows.
  • the calculated LED data Dbf1 and Dbf2 are similarly switched and accepted for each frame by the LED output value switching unit 730, and are given to the backlight drive circuit 4 as one continuous LED data Db.
  • the detailed configuration of the odd-numbered frame processing unit 710 will be described with reference to FIG. Since the detailed configuration of the even frame processing unit 720 is the same, the description thereof is omitted.
  • FIG. 29 is a block diagram showing a detailed configuration of the odd-numbered frame processing unit.
  • the odd frame processing unit 710 is the first except that the image memory 712 has the same function as that of the first embodiment except that the image data for one frame is stored, and the liquid crystal data for one frame is calculated.
  • the same components as in the first embodiment will be omitted, and the operation of the time change correction unit 715 that is a characteristic component will be described in detail.
  • the time change correction unit 715 receives the odd-numbered frame (before correction) LED data calculated by the LED output value calculation unit 711 based on the input image Dv1, and from the even-numbered frame processing unit 720 the previous frame that is the even-numbered frame. Receiving (corrected) LED data Dbf2, out of the luminance values set in each area in the immediately preceding frame, the luminance value whose change amount is equal to or greater than a predetermined threshold value, as will be described later, the change amount less than the threshold value And is output as LED data Dbf1 (after correction).
  • the display luminance calculation unit 713 calculates actual display luminance Db1c in each area based on the LED data Dbf1, and the LCD data calculation unit 714 calculates liquid crystal data Daf1 based on the display luminance Db1c.
  • a method for correcting LED data in the time change correction unit 715 will be described with reference to FIGS.
  • FIG. 30 is a diagram illustrating an example of an input image that changes from frame to frame, a lighting state of the LED unit, and a display state of the liquid crystal panel.
  • the eight LED units arranged in 2 rows and 4 columns shown in FIG. 30 are turned on according to the LED data Dbf1 in the odd-numbered frame, and are turned on according to the LED data Dbf2 in the even-numbered frame.
  • the contents of the circles indicating the lighting states of these LED units are the same as those shown in FIG.
  • the input image Dv is all dark in the first frame (here, the minimum luminance), brightens from the vicinity of the right edge of the image for each frame, and all bright in the fifth frame. (In this case, the maximum luminance).
  • the time change correction unit 715 corrects the LED data Dbf1 and Dbf2 determined according to the input image. Specifically, as described above, when the luminance value changes to a predetermined threshold value (for example, 80% of the maximum luminance value) or more, correction is performed so as to change with a smaller amount of change (for example, 50% of the amount of change). To do.
  • the time change correction unit 715 includes the LED data Dbf2 provided to the LED unit corresponding to the second frame (the LED unit in the fourth column from the left in the figure).
  • the value (luminance value) is corrected to an intermediate value (in this case, an intermediate luminance value 127) in the luminance change.
  • the display state of the liquid crystal panel in the frame can completely reproduce the input image (the brightness). This is not possible, and the vicinity of the right edge of the display image is in a slightly dark state (not the maximum gradation).
  • the time change correction unit 715 determines the luminance value of the LED data Dbf2 given to the corresponding LED unit (the LED unit in the third column from the left in the figure) in the third frame. It is corrected to an intermediate value (intermediate luminance value 127). The luminance value of the LED data Dbf2 given to the LED units in the fourth column from the left is corrected so that the change is suppressed because the amount of change from the corresponding luminance value in the second frame does not exceed the threshold value. There is nothing.
  • FIG. 31 is a diagram showing the same input image as shown in FIG. 30, the lighting state of the LED unit, and the display state of the liquid crystal panel when the LED data is not corrected.
  • the shift between the input image Dv and the display image is larger in the case shown in FIG. This is because the luminance values of the LED units in the fourth column in the third frame, the third column in the fourth frame, and the second column in the fifth frame shown in FIG. 31 are intermediate values.
  • the intermediate value is calculated independently of the LED data DBf1 ′ corresponding to the even frame and the LED data DBf2 ′ corresponding to the odd frame (without exchanging the contents). This is because.
  • FIG. 30 the shift between the input image Dv and the display image (that is, display incompleteness) is larger in the case shown in FIG.
  • the luminance values of the LED units in the fourth column in the third frame, the third column in the fourth frame, and the second column in the fifth frame shown in FIG. 31 are intermediate values.
  • the intermediate value is calculated independently of the LED data DB
  • the luminance values of the LED units in the fourth column in the third frame are delayed by a time constant or the like because the change from the minimum luminance value in the first frame to the maximum luminance value in the third frame is delayed. Intermediate values are given.
  • the LED data of each other is not referred to in the parallel calculation, it is more suitable for the gradation change of the input image than in the present embodiment in which the LED data immediately before (that is, one frame before) is referred to.
  • the change in the luminance of the LED is delayed, resulting in a decrease in display quality.
  • the LED data correction operation of the time change correction unit 715 will be described using different input image examples.
  • FIG. 32 is a diagram showing another example of an input image example that changes from frame to frame, the lighting state of the LED unit, and the display state of the liquid crystal panel.
  • the input image Dv is all bright in the first frame (maximum brightness), becomes darker from the vicinity of the right edge of the image every frame, and is all dark in the fifth frame (minimum). Brightness).
  • the time change correction unit 715 corrects the LED data Dbf1 and Dbf2 determined according to the input image.
  • the time change correction unit 715 changes the value (luminance value) of the LED data Dbf2 given to the corresponding LED unit (the LED unit in the fourth column from the left in the figure) in the second frame. Is corrected to an intermediate value (here, intermediate luminance value 127).
  • the display state can completely reproduce the input image (its brightness). This is because the light transmittance in the liquid crystal from the LED unit may be set to zero. However, in this case, it is not necessary to turn on the LED unit (at an intermediate luminance value) in the first place, and area active control that reduces the power consumption by turning off the backlight when the image of the corresponding area is black. Result is different. The same applies to the LED units in the third row and the second row in the third to fifth frames.
  • FIG. 33 is a diagram showing the same input image as that shown in FIG. 32, the lighting state of the LED unit, and the display state of the liquid crystal panel when the LED data is not corrected.
  • the number of LED units that are lit at the intermediate luminance value is larger in the case shown in FIG. In this way, there are many LED units having an intermediate value because the LED data DBf1 ′ corresponding to the even frame and the LED data DBf2 ′ corresponding to the odd frame are independent of each other (the contents are exchanged). This is because it is calculated. For example, in FIG.
  • the luminance values of the LED units in the fourth column in the third frame are delayed by the time constant or the like from the change from the maximum luminance value in the first frame to the minimum luminance value in the third frame. Intermediate values are given.
  • the LED data of each other is not referred to in the parallel calculation, it is more suitable for the gradation change of the input image than in the present embodiment in which the LED data immediately before (that is, one frame before) is referred to.
  • the change in the luminance of the LED is delayed, resulting in unnecessary lighting of the LED unit (at the intermediate luminance value), resulting in an increase in power consumption.
  • the time change correction unit 715 included in the odd-numbered frame processing unit 710 in this embodiment receives the LED data Dbf1 of the odd-numbered frame and the LED data Dbf2 of the immediately-preceding frame that is the even-numbered frame.
  • a luminance value whose change amount is equal to or greater than a predetermined threshold value is corrected so as to become a change amount less than the threshold value as will be described later, and is output as LED data Dbf1 (after correction).
  • the display quality can be prevented from being lowered according to the contents of the input image data, or the power consumption can be reduced even when the display quality is not lowered. .
  • the input images are allocated alternately (in two) in units of frames.
  • the input images are allocated in three or more so that three or more input images are generated in units of frames. May be.
  • the structure which distributes by the some frame unit may be sufficient.
  • an image in which the brightness of the image may change greatly every frame (typically, a three-dimensional image in which the left-eye image and the right-eye image are switched for each frame) is input.
  • a unique effect that flicker can be prevented is obtained.
  • FIG. 34 is a diagram illustrating an example of an input image that is a three-dimensional image, a lighting state of the LED unit, and a display state of the liquid crystal panel.
  • the third to sixth input images include a dark (minimum luminance value) region whose position is on the left side of the center in odd frames and in the center in even frames. Each is changing to the right. The change is caused by recognizing the deviation of the position in the left-right direction between the left-eye image and the right-eye image included in the 3D video as the depth of the image.
  • a general three-dimensional display device is used in combination with a glasses-type shutter device that can alternately block the user's field of view on the left and right.
  • This shutter device blocks the right eye field of view when the left eye image is displayed on the display panel, and blocks the left eye field of view when the right eye image is displayed.
  • the positional deviation in the left-right direction of the two images can be recognized as a parallax in a pseudo manner, so that the user can have a sense of depth in the image. Since the 3D video is generated in this way, unless the depth to be given to the user is changed, the left-eye image and the right-eye image have a certain horizontal displacement, and each frame in each frame The left-eye images are substantially at the same position, and the left-eye images are also at substantially the same position.
  • the second row of LED units has an intermediate luminance. Illuminated, and in the fourth and sixth frames, the LED units in the third row are lit with intermediate luminance. This state is the same lighting state in subsequent frames as long as the content of the input image does not change.
  • FIG. 35 is a diagram showing the same input image as shown in FIG. 34, the lighting state of the LED unit, and the display state of the liquid crystal panel when the LED data is not corrected.
  • the LED units in the second row or the third row are lit with intermediate luminance.
  • the LED units in the second row are lit (turned off) at the minimum luminance, unlike the case shown in FIG. LED unit is lit at maximum brightness.
  • the LED units in the third row are lit at the minimum brightness (turned off), and the LED units in the second row are lit at the maximum brightness, contrary to the lighting state of the fifth frame.
  • Such a lighting state is the same in the subsequent two frames as long as the content of the input image does not change. Therefore, in this state, the LED units in the second or third row blink for every successive frame, and are recognized as flicker by the person who sees the display.
  • FIG. 36 is a block diagram showing a detailed configuration of the area active drive processing unit 5 in the present embodiment.
  • the area active drive processing unit 5 shown in FIG. 36 has an image time division unit 705 that distributes input images frame by frame (time division) and performs parallel processing, as in the fourth embodiment, and will be described later.
  • the odd-numbered frame processing unit 810 and the even-numbered frame processing unit 820 that perform region division similar to those in the first embodiment, and the LED output value switching unit 730 and the LCD data switching unit 740 similar to those in the fourth embodiment are provided. .
  • the input image Dv is switched between the odd frame and the even frame by the image time division unit 705, so that the input image is time-divided into two in units of frames.
  • the brightness of the backlight light source is calculated in parallel (within two frame periods).
  • the odd-numbered frame processing unit 810 and the even-numbered frame processing unit 820 exchange LED data (light emission luminance data) Dbf1 and Dbf2 that are calculated backlight luminance data (specifically, as described later).
  • LED data light emission luminance data
  • Dbf1 and Dbf2 backlight luminance data
  • FIG. 37 is a block diagram showing a detailed configuration of the odd-numbered frame processing unit in the present embodiment.
  • An odd frame processing unit 810 shown in FIG. 37 divides an input image and performs parallel processing, thereby an image region dividing unit 905 having the same functions as those in the first embodiment, and first and second region processing units. 910, 920, an LED output value combining unit 930, and an LCD data combining unit 940.
  • the input image Dvf1 of the odd-numbered frame is divided into two input images f1Dv1 and f1Dv2 by the image region dividing unit 905, and the brightness of the backlight light source is calculated in the first and second region processing units 910 and 920. In parallel.
  • the first and second area processing units 910 and 920 exchange the LED data (light emission luminance data) Db1 and Db2 that are the calculated backlight luminance data with each other and immediately before (even or odd) )
  • the LED data Dbf1 and Dbf2 of the frame both the backlight luminance in the other region and the backlight luminance in the immediately preceding frame that are not calculated in the region are referred to.
  • FIG. 38 is a block diagram showing a detailed configuration of the first area processing unit in the present embodiment.
  • the first area processing unit 910 shown in FIG. 38 stores an image memory 912 having the same function as that of the first embodiment except that the left half image data f1Dv1 of the odd-numbered frame is stored, and the image data f1Dv1.
  • the LCD data calculation unit 914 is the same as that of the first embodiment except that the liquid crystal data corresponding to is calculated, and the LED is the same as that of the first embodiment except that the LED data corresponding to the image data f1Dv1 is calculated.
  • An output value calculation unit 911 and a luminance diffusion filter 14 similar to those in the first embodiment are provided, and a time change correction unit 715 having a function similar to that in the fourth embodiment is further provided.
  • This time change correction unit 915 is similar to the time change correction unit 715 in the fourth embodiment, among the luminance values set in the corresponding area included in the LED data Dbf2 in the even frame that is the immediately preceding frame.
  • a luminance value whose change amount is equal to or greater than a predetermined threshold value is corrected so as to be a change amount less than the threshold value, and is output as (corrected) LED data Dbf1.
  • the input image Dv is divided into even frames and odd frames, and is calculated in parallel. Further, the first embodiment is applied to each image. As in the case, by dividing the image into left and right parts and performing parallel calculation, as with the effect of the fourth embodiment, it is possible to prevent a reduction in display quality or to reduce power consumption. Similarly to the effect of the first embodiment, since the pixel display is performed with the correct display gradation over the entire screen, it is possible to prevent the display quality from being deteriorated.
  • the input image is time-divided into two and then divided into two regions to obtain four input images.
  • the number of time divisions and the number of region divisions are limited. Absent.
  • a configuration may be employed in which each divided input image is further time-divided (in units of frames) after the region is divided.
  • the backlight in the overlapping area near the boundary of the input image as in the second or third embodiment instead of dividing the area as in the first embodiment, the backlight in the overlapping area near the boundary of the input image as in the second or third embodiment.
  • a configuration in which luminance data is exchanged may be used. With this configuration, the effects of the second or third embodiment can be exhibited together.
  • FIG. 39 is a block diagram showing a detailed configuration of the area active drive processing unit 5 in the present embodiment.
  • the area active drive processing unit 5 shown in FIG. 39 divides an input image into four parts and performs parallel processing, so that an image region dividing unit 1005, first to fourth region processing units 1010 to 1040, An LED output value combining unit 1130 and an LCD data combining unit 1140 are provided.
  • the first to fourth area processing units 1010 to 1040 are configured to mutually exchange LED data Db1 to Db4.
  • the first to fourth area processing units 1010 to 1040 have the same configuration and operate in the same manner. Therefore, the configuration of the first area processing unit 1010 will be described below with reference to FIG. Focus on the explanation.
  • FIG. 40 is a block diagram showing a detailed configuration of the first area processing unit in the present embodiment.
  • the first area processing unit 1010 includes an image memory 1012 similar to that of the first embodiment and a luminance diffusion filter 14, and the first area processing unit 1010 is the first area except that four data corresponding to four areas are processed.
  • An LED output value calculation unit 1011 having a function similar to that of the embodiment, a display luminance calculation unit 1013, and an LCD data calculation unit 1014 are provided. Since these operations are the same as those in the first embodiment except that the area is divided into four, description thereof is omitted here.
  • first to fourth memory circuits 1051 to 1054 are further provided as components for exchanging LED data Db1 to Db4 corresponding to the four areas.
  • These first to fourth storage circuits 1051 to 1054 are memories for storing the corresponding LED data Db1 to Db4, respectively, and data is generated according to a clock signal CLK output from a clock generator (not shown). Read and write.
  • the clock signal CLK is formed in accordance with a vertical synchronization signal included in an input image signal or a timing signal generated based on the vertical synchronization signal. Then, the timing of the entire display device can be accurately adjusted with a simple configuration. Note that the vertical synchronization signal may be used as it is as the clock signal CLK.
  • the LED data Db1 among the LED data Db1 to Db4 is calculated by the LED output value calculation unit 1011 and written to the first storage circuit 1051 as in the case of the first embodiment.
  • the LED data Db1 written in the first memory circuit 1051 is read according to the clock signal CLK, and the first (not shown) built in the second to fourth area processing units 1020 to 1040, respectively. Data is written into the memory circuit 1051 simultaneously or sequentially. In this way, the LED data Db2 to Db4 are similarly written to the second to fourth storage circuits 1052 to 1054 built in the first to fourth area processing units 1010 to 1040.
  • the LED data Db1 to Db4 have been described as being exchanged with each other.
  • the first area processing unit 1010 needs all of the LED data Db2. is not. That is, an image area that is not a calculation target for the image area that is a calculation target in the first area processing unit 1010 (which is a calculation target in the second or third area processing units 1020 and 1030).
  • Not all of the backlight light sources corresponding to (image area) have an influence, but the extent to which an influence occurs between areas adjacent to the image area or areas close to each other (for example, up to two or three away). It is. Therefore, the exchanged LED data Db1 to Db4 may be partial data corresponding to the range in which the influence occurs, specifically, a data portion corresponding to an area adjacent to or close to another region.
  • the configuration in which the LED data Db1 to Db4 corresponding to the four areas are exchanged with each other has been described.
  • the number of areas is not limited.
  • the LED data Db1 to Db8 corresponding to the eight areas is exchanged with each other. There may be.
  • the configuration shown in FIG. 40 as the number of data to be exchanged increases, the number of wirings therefor increases.
  • each region processing unit is connected by a serial transmission line and the LED data Db1 to Db8 is transmitted serially. More preferred.
  • FIG. 41 is a timing diagram schematically showing a clock signal and a serial data signal when serially transmitting eight LED data.
  • the serial data signal SDATA has a content that starts data transmission in synchronization with the clock signal CLK, sequentially transmits the LED data Db1 to Db8, and ends the data transmission. Since the serial data signal SDATA is transmitted on one serial transmission line, a large amount of LED data can be transmitted with such a simple wiring configuration.
  • the present invention relates to an image display device having a backlight, such as a liquid crystal display device, and is suitable for an image display device that drives a display panel while controlling the luminance of a plurality of backlight light sources based on an input image.
  • a backlight such as a liquid crystal display device
  • DESCRIPTION OF SYMBOLS 2 ... Liquid crystal display device 3 ... Backlight 4 ... Backlight drive circuit 5 . Area active drive process part 6 ... Panel drive circuit 7 ... Liquid crystal panel 14 ... Luminance diffusion filter 505,1005 ... Image area division part 510,610,910, DESCRIPTION OF SYMBOLS 1010 ... 1st area
PCT/JP2011/061026 2010-06-23 2011-05-13 画像表示装置および画像表示方法 WO2011162040A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201180030595.XA CN102947877B (zh) 2010-06-23 2011-05-13 图像显示装置和图像显示方法
US13/703,439 US9123280B2 (en) 2010-06-23 2011-05-13 Image display device and image display method
EP11797927.8A EP2587474A4 (en) 2010-06-23 2011-05-13 IMAGE DISPLAY DEVICE AND IMAGE DISPLAY METHOD

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010-142767 2010-06-23
JP2010142767 2010-06-23

Publications (1)

Publication Number Publication Date
WO2011162040A1 true WO2011162040A1 (ja) 2011-12-29

Family

ID=45371241

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2011/061026 WO2011162040A1 (ja) 2010-06-23 2011-05-13 画像表示装置および画像表示方法

Country Status (4)

Country Link
US (1) US9123280B2 (un)
EP (1) EP2587474A4 (un)
CN (1) CN102947877B (un)
WO (1) WO2011162040A1 (un)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013191027A1 (ja) * 2012-06-20 2013-12-27 ソニー株式会社 信号処理装置、信号処理方法、及びプログラム
WO2020049949A1 (ja) * 2018-09-03 2020-03-12 シャープ株式会社 表示装置
CN113272882A (zh) * 2020-09-02 2021-08-17 祝君芬 Lcd和led混合显示屏以及lcd和led混合屏时钟
JP7404162B2 (ja) 2020-06-10 2023-12-25 株式会社ジャパンディスプレイ 表示装置

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10165218B2 (en) * 2013-07-24 2018-12-25 Samsung Electronics Co., Ltd. Display power reduction using histogram metadata
KR102286635B1 (ko) 2014-12-29 2021-08-09 삼성디스플레이 주식회사 표시 장치
US10192495B2 (en) * 2015-10-15 2019-01-29 Canon Kabushiki Kaisha Display apparatus with lighting device, control method for display apparatus, and storage medium
CN105405412B (zh) * 2015-12-23 2017-11-03 深圳Tcl新技术有限公司 背光驱动控制方法和系统
KR20180072910A (ko) * 2016-12-21 2018-07-02 삼성디스플레이 주식회사 표시장치 및 그의 구동방법
JP6812862B2 (ja) * 2017-03-14 2021-01-13 株式会社リコー 画像処理システム、撮像装置、画像処理方法及びプログラム
JP2018180333A (ja) * 2017-04-14 2018-11-15 株式会社ジャパンディスプレイ 表示装置及び表示モジュール
CN110785803B (zh) * 2017-06-21 2023-03-24 深圳通锐微电子技术有限公司 图像显示装置
CN107342056B (zh) * 2017-07-31 2019-05-31 天津大学 一种基于改进混洗蛙跳算法的区域背光动态调光方法
CN109410891B (zh) * 2017-08-17 2021-01-01 群创光电股份有限公司 显示器以及其操作方法
JPWO2019163999A1 (ja) * 2018-02-26 2020-12-17 シャープ株式会社 映像処理装置、表示装置、映像処理方法、プログラムおよび記録媒体
JP2019152838A (ja) * 2018-03-06 2019-09-12 シャープ株式会社 表示装置、表示方法及びプログラム
US10909403B2 (en) 2018-12-05 2021-02-02 Microsoft Technology Licensing, Llc Video frame brightness filter
US10778932B2 (en) 2018-12-05 2020-09-15 Microsoft Technology Licensing, Llc User-specific video frame brightness filter
US20200186764A1 (en) * 2018-12-05 2020-06-11 Microsoft Technology Licensing, Llc Color-specific video frame brightness filter
CN111899694B (zh) * 2019-05-06 2022-06-07 京东方科技集团股份有限公司 背光模组的背光控制方法和装置、显示装置
CN113971938B (zh) * 2021-12-22 2022-04-05 北京灵犀微光科技有限公司 一种分区照明方法、装置、设备及计算机存储介质
US20230317023A1 (en) * 2022-04-05 2023-10-05 Meta Platforms Technologies, Llc Local dimming for artificial reality systems

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005241678A (ja) 2004-02-24 2005-09-08 Matsushita Electric Ind Co Ltd 液晶表示装置
WO2009054223A1 (ja) * 2007-10-25 2009-04-30 Sharp Kabushiki Kaisha 画像表示装置
WO2009096068A1 (ja) * 2008-01-31 2009-08-06 Sharp Kabushiki Kaisha 画像表示装置および画像表示方法
WO2010001681A1 (ja) * 2008-07-03 2010-01-07 シャープ株式会社 画像表示装置および画像表示方法
WO2010024009A1 (ja) * 2008-09-01 2010-03-04 シャープ株式会社 画像表示装置および画像表示方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4895450B2 (ja) * 2000-11-10 2012-03-14 三星電子株式会社 液晶表示装置及びその駆動装置と方法
US8085282B2 (en) * 2006-12-13 2011-12-27 Canon Kabushiki Kaisha Image display apparatus and driving method of image display apparatus
US20100013872A1 (en) * 2007-06-11 2010-01-21 Takeshi Masuda Liquid crystal display device
KR101604652B1 (ko) * 2008-06-04 2016-03-21 삼성디스플레이 주식회사 광원 로컬 디밍 구동 방법, 이를 수행하기 위한 광원 장치및 이 광원 장치를 갖는 표시 장치
US8363100B2 (en) * 2008-11-19 2013-01-29 Honeywell International Inc. Three dimensional display systems and methods for producing three dimensional images

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005241678A (ja) 2004-02-24 2005-09-08 Matsushita Electric Ind Co Ltd 液晶表示装置
WO2009054223A1 (ja) * 2007-10-25 2009-04-30 Sharp Kabushiki Kaisha 画像表示装置
WO2009096068A1 (ja) * 2008-01-31 2009-08-06 Sharp Kabushiki Kaisha 画像表示装置および画像表示方法
WO2010001681A1 (ja) * 2008-07-03 2010-01-07 シャープ株式会社 画像表示装置および画像表示方法
WO2010024009A1 (ja) * 2008-09-01 2010-03-04 シャープ株式会社 画像表示装置および画像表示方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2587474A4

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013191027A1 (ja) * 2012-06-20 2013-12-27 ソニー株式会社 信号処理装置、信号処理方法、及びプログラム
WO2020049949A1 (ja) * 2018-09-03 2020-03-12 シャープ株式会社 表示装置
JPWO2020049949A1 (ja) * 2018-09-03 2021-08-26 シャープ株式会社 表示装置
JP7404162B2 (ja) 2020-06-10 2023-12-25 株式会社ジャパンディスプレイ 表示装置
CN113272882A (zh) * 2020-09-02 2021-08-17 祝君芬 Lcd和led混合显示屏以及lcd和led混合屏时钟

Also Published As

Publication number Publication date
US20130093802A1 (en) 2013-04-18
CN102947877A (zh) 2013-02-27
CN102947877B (zh) 2016-01-13
EP2587474A1 (en) 2013-05-01
EP2587474A4 (en) 2013-12-11
US9123280B2 (en) 2015-09-01

Similar Documents

Publication Publication Date Title
WO2011162040A1 (ja) 画像表示装置および画像表示方法
KR101732735B1 (ko) 영상 처리 장치, 표시 장치 및 표시 시스템
US20100110112A1 (en) Backlight apparatus and display apparatus
ES2379095T3 (es) Controlar una pantalla que comprende un espacio de color RGBW
US7002539B2 (en) Field sequential color display device
JP4082689B2 (ja) 液晶表示装置
TWI435297B (zh) 影像顯示裝置及驅動影像顯示裝置之方法
US9076397B2 (en) Image display device and image display method
RU2448374C1 (ru) Устройство отображения изображения и способ отображения изображения
JP5514894B2 (ja) 画像表示装置および画像表示方法
US20080273005A1 (en) Mixed color sequential controlling method and back ligh module and display device using the same
US8482605B2 (en) Image processing device, image display device, and image processing and display method and program
JP5605175B2 (ja) 立体映像表示装置
WO2010098020A1 (ja) バックライト装置およびこれを用いた映像表示装置
WO2011148663A1 (ja) 液晶表示装置およびテレビジョン受像機
KR20180006545A (ko) 표시 장치
JP2012189629A (ja) 表示装置及び表示制御方法
US9402072B2 (en) Signal processing device and video display device including the same
JP5413987B2 (ja) 液晶表示装置、駆動回路および駆動方法
WO2013018822A1 (ja) 画像表示装置および画像表示方法
KR20170100099A (ko) 액정 표시 장치 및 그 구동 방법
JP5316516B2 (ja) 立体映像表示装置
WO2012050017A1 (ja) 画像表示装置および画像表示方法
WO2013080907A1 (ja) 画像表示装置および画像表示方法
JP2013213961A (ja) 映像表示装置

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 201180030595.X

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11797927

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 13703439

Country of ref document: US

NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 2011797927

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: JP